Reversing valve



March 15, 1932. H. MOLL REVERSING VALVE Filed Aug. 25, 1928 2 Sheets-Sheet 1 March 15, 1932. H. MoLL 1,849,242

REVERSING VALVE Filed Aug. 23, 1928 2 Sheets-Sheet 2 I l j L J L l 1 s i amy m m w m m m m m w Patented Mar. 15, 1932 PATENT Fics HERMANN MoLL, `oF NEUWIEDQRASSELSTEIN. GERMANY BEVER-SING VALVE f Appnation med August 2s. 192s, serial No. 301,509, and in' (germany im'elnmry 21, 1927.

rlhis invention relates to a new and improved reversing valve and more particularly to a reversing valve of the type especially adapted for use in reversing gas or air flow .l in connection with regenerative furnaces or the like.

The invention relates particularly to the type of valve in which a sliding valve member or shell is enclosed within an outer casing.

In such valves three openings areprovided in the base and the movable shell is adapted to connect one of the openings with either o-ne of the other two openings as desired. An additional opening is provided into the casing, this being connected during the use of the valve with the one of the first three open, ings not covered by the shell, or movable valve member.

ln valves oi this character the working parts are exposed to high temperatures and the surface upon which the shell or valve member slides is subject to wear. The operating rods or bars extending into the casing Vare subjected to the high temperatures caused by the flow of gases through the valve.

It is an object of the present invention to provide a valve of this characterin which the sliding surfaces may be properly lubricated to minimize Wear.

It is a further object to provide a construction in which the valve base and operating rods may be water cooled. Itis an additional object to Vprovide a construction in which the valve operating rods may be withdrawn -from the valve casing when not actually in use in y moving the valve shell.

this character which is simple in design and adapted for commercial production.

the description proceeds.

Figure 1 is an elevation partly in section showing one forni of construction;

Figure 2 is a planview showing one of the '45 push rod operating assemblies;

Figure 3 is a view similar to Figure 1, but

showing a modified form of construction;4

and

k continuous lubricating grooves 20.

Other and further objects will appear asfgrooves may contain suitablep'acking sam-3:90

Referring first to the form of construction shown in Figure 1, thezvalve casing 1'is provided with the openingor vpassage 2. This casing'fl restszupon thebase plate 'or guide plate '23. The movable shell 3 is permanently x r55 Vsecured to the sliding trame 4,which slides upon the base plate 23. The push'rod 5 eX- tends `through av bearing 7 in the yside of the rcasing 1 and engages the frame 4. The rod v5 is secured to the rack bar 8, which is re-v 60 ciprocated by the gear 9. "This gear 9 is roi" tated through the'r gearreduction assembly 1()v by power supplied by the electric motor `11. similar push rod 6 is located uponv the Y opposite side of the casing and is driven inl 05 lthe same manner. It will be noted that theV- rodsV and 6 andtheir rack barsV are shown as the :trame 4 so as to move itin either direction. The piston'24 is secured to theouter portion of the bar 15 and this piston is operated within the cylinder 18. The lezriblewo connection 17 is provided for the introduc-zli' tion of coolin Huid. It Vwill be understood that fluid un er pressure for operating the piston 24 may be introduced into cylinder 18 by any V usual form of valvecontrolled connections.- y y A y The base A plate 23, as best shown in Figure 4, is provided upon itsfupper surface with These rated with lubricant. The'ianges 25 are pro vided for guidingtheframe4 in itsmovement- As clearly shown in Figures land 3, the base plate V23 is provided with the internal passages. l19 into whichs'uitable cooling uidg95 may be' introduced.v The webs "or flanges 21 are' further provided to aid in cooling lthe base plate. y

Thethree adjacent'v'passages 12, 13 andv14 entendupwardlythrough thebase plate k also through the furnace structure supporting the plate. In one form of construction where the valve would he used, the passage 13 would lead to the stack. The passages 12 and 14 are connected to the Ygas regenerators at the two ends of the furnaces. rllhe opening 2 in the casing 1 is connected to the source of gas supply which may be a gas main leading to gas producers. It will he understood that the construction may he used in connection with the control of airV rather than combustible gas and may be used for any other purposes for which they are adapted.

In the form of construction shown in Figures 1 and 2, the push rods 5 and G are used alternately. They are used for pushing only and notfor pulling, and have Vno permanent connection with the frame 4 of the valve shell. With the parts in the position shown in Figure 1, the valve shell 3 has just been pushed to the left to reverse the operation of the furnace. The motor driving the rod 5 will then he reversed and the rod withdrawn until its inner end is approximately flush with the inner end of the bearing 7.- During this portion of the operating cycle of the furnace the parts will remain in this position. Neither push rod 5 nor 6 is exposed to the heat and erosive action of the gases in the valve casing.

Whenit is desired to reverse the furnace by moving the valve shell to the right, the left-hand motor thrusts the push rod 6 inwardly until the shell is shifted to cover the openings 13 and'14. The .passage 12 is thus put is communication with the passage or opening 2. After the movement is -completed the motor is reversed land the push rod 6 withdrawn. In either position it will "be noted that the cross frame portion 4 of the frame 4 'covers the lubricant containing grooves of that portion of the base plate'covered by the shell so that the lubricant is not exposed 5to the flow of the products of comhustion.

In the form of construction shown in Figure 3 the push rod 15 serves to both push and pull the valve .shell 3.l With the valve shell to the left, as shown in Figure 3, the Vrod is exposed to the gas flow between passages 2 and 14. The fact that it is water cooled, however, minimizes the effect upon the rod of the gas flow.

I have shown two preferred forms of my invention hy way of illustration, lout it will he understood that it iscapable of further changes and modifications to adapt it to varying conditions, and' I contemplate such changes .and mod-ilications as come within the spirit and scope of the appended claims.

" I claim: l

1. In a reversing valve for regenerative furnaces, 'a casing, aguide plate, a .shell slidi .ably .mounted on thegu'ide plate within the casing, and 'independently operable separate push rods provided with means for forcing them within the casing to engage and move the shell.

2. In a reversing valve for regenerativel ieu 

